Find an email address in Active Directory

If you have ever needed to find an email address being used by a user/contact/distribution list/etc in AD, then read on:

1. Open your ADUC MMC, rightclick Saved Queries --> New --> Query --> type a name and description (if you want) --> Define Query
2. In the Find dropdown box, select Custom Search --> Advanced --> type '(proxyAddresses=smtp:email@domain.com)' (substituting the email address you are looking for) --> OK --> OK
3. Create as many as you need, or just create one and edit the query as you need it.